Sudoku

Sudoku is the classic number puzzle with a clean, easy-to-read grid. Fill the 9×9 board with digits 1 to 9 so that every row, every column and every 3×3 box contains each digit exactly once. Every puzzle has a single solution that you can reach by logic, without guessing.

• Four difficulty levels: easy, medium, hard and expert
• New puzzles generated on the fly and graded by the techniques a person needs to solve them
• Every puzzle has exactly one solution
• Candidate notes that clear themselves when you place a digit
• Highlighting of matching digits and optional mistake marking
• Undo, erase, hints and restarting the same puzzle
• Statistics for each level: puzzles played and solved, best time and average time
• Your game in progress is saved, so you can come back to it later
• Short tutorial, sounds, music and vibration

How to play
Tap an empty square, then a digit on the keypad below the grid. Use the Notes button to pencil in small candidates, the digits that could still fit in a square. Easy puzzles only need squares with a single possible digit, medium ones also ask you to find the only place for a digit, while hard and expert puzzles require pairs, locked candidates and more advanced techniques. If you get stuck, a hint fills the correct digit into the selected square.

Sudoku is free to play and contains ads. Rewarded ads are always optional: each hint is unlocked by watching a short ad, and once per puzzle, from the pause menu, an ad can fill in the notes for you, so every empty square shows the candidates that still fit. Undo and erase are always free. A one-time purchase removes ads, and hints and notes then need no ad. The game works without an internet connection (ads need one), your progress is saved on your device, and it is available in 7 languages: English, Polish, German, French, Spanish, Portuguese and Italian.

Recent changes:
Smoother touch controls, sharper text and stability improvements.